<template>
	<div :class="{'hidden':hidden}" class="pagination-container">
		<el-pagination
			:background="background"
			:current-page.sync="currentPage"
			:page-size.sync="pageSize"
			:layout="layout"
			:page-sizes="pageSizes"
			:pager-count="pagerCount"
			:total="total"
			v-bind="$attrs"
			@size-change="handleSizeChange"
			@current-change="handleCurrentChange"
		/>
	</div>
</template>

<script>
    import { scrollTo } from '@/utils/scroll-to';

    export default {
        name: 'Pagination',
        props: {
            total: {
                required: true,
                type: Number
            },
            page: {
                type: Number,
                default: 1
            },
            limit: {
                type: Number,
                default: 20
            },
            pageSizes: {
                type: Array,
                default() {
                    return [10, 20, 30, 50];
                }
            },
            // 移动端页码按钮的数量端默认值5
            pagerCount: {
                type: Number,
                default: document.body.clientWidth < 992 ? 5 : 7
            },
            layout: {
                type: String,
                default: 'total, sizes, prev, pager, next, jumper'
            },
            background: {
                type: Boolean,
                default: true
            },
            autoScroll: {
                type: Boolean,
                default: true
            },
            hidden: {
                type: Boolean,
                default: false
            }
        },
        data() {
            return {
            };
        },
        computed: {
            currentPage: {
                get() {
                    return this.page;
                },
                set(val) {
                    this.$emit('update:page', val);
                }
            },
            pageSize: {
                get() {
                    return this.limit;
                },
                set(val) {
                    this.$emit('update:limit', val);
                }
            }
        },
        methods: {
            handleSizeChange(val) {
                if (this.currentPage * val > this.total) {
                    this.currentPage = 1;
                }
                this.$emit('pagination', { page: this.currentPage, limit: val });
                if (this.autoScroll) {
                    scrollTo(0, 800);
                }
            },
            handleCurrentChange(val) {
                this.$emit('pagination', { page: val, limit: this.pageSize });
                if (this.autoScroll) {
                    scrollTo(0, 800);
                }
            }
        }
    };
</script>

<style scoped>
.pagination-container {
  background: #fff;
  padding: 32px 16px;
}
.pagination-container.hidden {
  display: none;
}
</style>
